docs: correct minor errors in Installation doc

- Correct typo in tar flags
- Add Fedora 18 to list of supported OS's in 'Build Requirements' section

Signed-off-by: Mark Kavanagh <mark.b.kavanagh@intel.com>
Reviewed-By: Stephen Finucane <stephen.finucane@intel.com>
Reviewed-By: Mark Gray <mark.d.gray@intel.com>

Change-Id: If58a67487c909ec567b4962848c7e8d4a95b744d
tests: unit tests for the ovdk_vport API

Change-Id: I7e7c8f390974006f0c0549e1bb9012978fe5d3a2
Signed-off-by: Ciara Loftus <ciara.loftus@intel.com>
Reviewed-by: Kevin Traynor <kevin.traynor@intel.com>
lib: Fix file permissions

Change-Id: I4f7a07f1a9c9ea2a9ce1889c392c477bc11baa18
Signed-off-by: Stephen Finucane <stephen.finucane@intel.com>
Reviewed-by: Kevin Traynor <kevin.traynor@intel.com>